Lenovo ThinkSystem SN850 Setup Manual page 95

• NVMe drive
Displayed system memory less than installed physical memory
Complete the following steps until the problem is solved.
1. Make sure that:
a. You have installed the correct type of memory (see
b. Memory mirroring or memory sparing mode does not account for the discrepancy.
To determine the status of a DIMM, restart the server and press the key according to the on-screen
instructions to display theLXPM interface. Then, click System settings ➙ Memory.
2. If new memory has recently been installed, make sure that no configuration events are reported in the
event log. If there are any events, resolve them.
Note: DIMMs are verified as authentic Lenovo or IBM modules by the UEFI software. If any non-
authentic DIMMs are detected, an informational message appears in the system event log and memory
performance might be limited. Non-authentic DIMMs are not covered by your Lenovo warranty.
3. If the compute node was recently installed, moved, or serviced, make sure that the DIMMs are correctly
seated in the connectors (see
4. Make sure that all DIMMs are enabled. The compute node might have automatically disabled a DIMM
when it detected a problem, or a DIMM might have been manually disabled.
To determine the status of a DIMM, restart the server and press the key according to the on-screen
instructions to display the LXPM interface. Then, click System settings ➙ Memory.
5. Run memory diagnostics. When you start a server and press the key according to the on-screen
instructions, the LXPM interface is displayed by default. You can perform memory diagnostics from this
interface. From the Diagnostic page, click Run Diagnostic ➙ Memory test.
6. Remove DIMMs until the compute node is showing the correct amount of memory. Install one DIMM at a
time until you can determine which DIMM is not working properly. Remove that DIMM and replace it with
a good DIMM (see "Install a DIMM" on page 37
Note: After you install or remove a DIMM, you must change and save the new configuration information
by using the Setup utility. When you turn on the compute node, a message indicates that the memory
configuration has changed. Press the key according to the on-screen instructions to display the LXPM
interface. Then, save the configuration.
7. If the problem remains, contact Lenovo Support.
A Lenovo optional device that was just installed does not work
1. Make sure that:
• The device is supported for the compute node (see
index.shtml ).
• You followed the installation instructions that came with the device and the device is installed
correctly.
• You have not loosened any other installed devices or cables.
• You updated the configuration information in the Setup utility. Whenever memory or any other device
is changed, you must update the configuration.
2. Reseat the device that you just installed.
3. Replace the device that you just installed.
Voltage planar fault is displayed in the event log
Complete the following steps until the problem is solved.
"Install a DIMM" on page 37
for instructions).
"Install a DIMM" on page 37
for instructions).
https://static.lenovo.com/us/en/serverproven/
.
Chapter 5 Resolving installation issues
for instructions).
87